.back{
  width: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 26px;
}
.detail-select{
  width: 100%;
  position: fixed;
  top: 0;
  z-index: 999;
  border-bottom: 1px solid #f5f5f5;
}
.detail-content{
  margin-top: 44px;
}
.recommends{
  margin-bottom: 50px;
}